Name the file and
choose file type to "BVH Files (Bio Vision *.bvh)"
and save.
Now the "Character01:
Export to" pops up. Check the "Target Reference Character"
button. Click the ""
button to browse.
Another window opens
up, the "Open Reference Character". Select the "EyesJapan"
as the Reference Character, which has the similar skeleton structure
to iClone Avatar, and
click "OK". After you have clicked ok, this leads you back to
"Character01: Export to" window. Click "OK" to finish
all the export setting process.